[PATCH] [Transforms] Write basic -place-safepoints test, fix bug

[Ramkumar Ramachandra]

More work in the same direction.

Rewrite gc.statepoint, gc.result calls to use the IRBuilder API, and
write one additional test. TODO: work on CreateGCStatepoint to handle
both Call and Invoke; the invoke codepath calls gc.statepoint by hand
currently.

Should be simple enough to LGTM quickly and move forward.


http://reviews.llvm.org/D7456

Files:
  include/llvm/IR/IRBuilder.h
  lib/IR/IRBuilder.cpp
  lib/Transforms/Scalar/PlaceSafepoints.cpp
  test/Transforms/Safepoint/place.ll

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